Energy-saving efficient waste gas purification catalytic combustion treatment system

Abstract

The utility model discloses an energy-saving efficient waste gas purification catalytic combustion treatment system, and relates to the technical field of waste gas treatment, the treatment system comprises a first treatment device and a second treatment device, the first treatment device comprises an air inlet pipe, a four-stage filter, a zeolite rotating wheel, an adsorption fan and a main air pipe which are communicated in sequence; the second treatment device comprises an external waste heat utilization transducer and a CO furnace, and the CO furnace is communicated with the zeolite rotating wheel through a preheating pipeline group; the external waste heat utilization transducer is communicated with the zeolite rotating wheel through a first pipeline; the inlet of the CO furnace is communicated with the external waste heat utilization transducer through a second pipeline, and the outlet of the CO furnace is communicated with the external waste heat utilization transducer through a third pipeline. The external waste heat utilization heat exchanger is separated from the CO furnace, and the internal waste heat utilization heat exchanger is embedded into the CO furnace. By means of the structure, the size of the CO furnace is reduced, and the problems that waste gas inlet concentration fluctuation is large, heat exchange is unstable, and heating is not easy to control are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of waste gas treatment, and particularly relates to an energy-saving and efficient waste gas purification catalytic combustion treatment system. Background Technique

[0002] The waste gas emissions from industries such as petrochemical, coking, painting, and printing have exacerbated the increasingly severe atmospheric environment problems. When the environmental waste gas reaches a certain concentration, people will experience headaches, nausea, convulsions, and coma. Prolonged exposure to high-concentration waste gas will cause serious damage to people's livers, brains, and nervous systems. The main components of waste gas in small and medium-sized painting, printing and other industries are volatile organic compounds, such as alkanes, aromatic hydrocarbons, esters, aldehydes, and ketones, etc., which have the characteristics of low concentration, complex components, and large differences in ignition temperatures. Currently, the main waste gas treatment methods include: activated carbon adsorption technology, photocatalytic oxidation technology, direct combustion technology, and catalytic combustion technology, etc. Among them, the catalytic combustion technology can reduce the activation energy of organic waste gas through the action of a catalyst, lower the ignition temperature to 200°C to 400°C, save energy consumption, and can significantly reduce the generation of thermal NOx. The catalytic combustion technology is also widely used because of its energy-saving and efficient advantages.

[0003] Since the ignition temperature T1 of the waste gas catalytic combustion system needs to reach about 300°C, when the equipment is initially running, an electric heating tube or a natural gas burner is used to provide initial heat. After the equipment starts running and waste gas is introduced, under the condition that the waste gas catalytic combustion releases heat, we utilize the waste heat of the high-temperature tail gas after catalytic combustion to maintain the ignition temperature of the waste gas catalytic combustion. However, due to the influence of the intake concentration and the different waste heat utilization structures, the ignition temperature of the waste gas catalytic combustion is extremely unstable.

[0004] The conventional method on the market is: introducing the concentrated high-concentration waste gas at 50°C, first passing through the waste heat utilization heat exchanger + electric heating area, so that the waste gas is heated to 300°C, reaching the ignition catalytic temperature T1 of the waste gas. Under the action of the catalyst, the waste gas is oxidized and burned to release heat, and the clean high-temperature flue gas T2 (fluctuating between 350~650°C) is discharged. The high-temperature flue gas first passes through the waste heat utilization heat exchanger for indirect cross-exchange heat with the high-concentration waste gas at 50°C, then flows to another waste heat utilization heat exchanger for desorbing waste gas heat exchange, and finally is discharged into the atmosphere through the chimney.

[0005] After the waste gas has flowed through the above-mentioned process equipment, not only is the waste gas purified, but also the heat generated during the purification process is recovered and utilized. However, due to the change in the waste gas concentration, the temperature of the purified high-temperature flue gas fluctuates greatly, making it difficult to control the electric heating area and resulting in unstable operation of the equipment. For example, when the intake concentration continuously increases, the temperature of the high-temperature flue gas also continuously rises. Under the condition of a certain treatment air volume and the action of the same heat exchanger, the temperature of the waste gas after passing through the 1# heat exchanger continuously increases, far exceeding 300 °C, so that the temperature of the high-temperature tail gas continuously rises and exceeds the set safety value of 650 °C, causing the system to enter the alarm stop state. To solve the above problems, generally, while ensuring that the total intake air volume remains unchanged, the intake volume of the waste gas is reduced and fresh air is supplemented to dilute the concentration of the incoming waste gas, so as to reduce the temperature of the waste gas after catalytic combustion and ensure the safe and stable operation of the equipment. However, the disadvantage of this method is that the waste gas treatment volume of the entire set of equipment decreases, that is, the equipment cannot reach the treatment volume designed by the system, resulting in the relevant production equipment having to stop, thus having a greater impact. Or, another solution is to reduce the waste heat utilization heat exchanger so that the maximum waste gas volume and the highest waste gas intake concentration do not exceed the limit safety temperature in the high-temperature flue gas after catalysis, thus ensuring that the equipment can meet the maximum design treatment volume at any time and meeting the requirements of stable production operation. Although this method solves the production requirements, due to the small waste heat utilization heat exchanger, most of the time the waste gas does not meet the minimum ignition temperature when passing through the waste heat utilization heat exchanger, and electric heating tubes need to be used for auxiliary heating, resulting in high energy consumption during equipment operation and not achieving the most energy-saving purpose.

[0006] Therefore, an energy-saving and efficient waste gas purification catalytic combustion treatment system is proposed. Utility Model Content

[0007] The purpose of the present utility model is to overcome the deficiencies of the prior art and provide an energy-saving and efficient waste gas purification catalytic combustion treatment system.

[0008] The purpose of the present utility model is achieved by the following technical solutions:

[0009] An energy-saving and efficient waste gas purification catalytic combustion treatment system includes a first treatment device and a second treatment device. The first treatment device includes an air inlet pipe, a four-stage filter, a zeolite rotor, and an adsorption fan that are connected in sequence. The outlet of the adsorption fan is connected to a main air pipe. The second treatment device includes an external waste heat utilization transducer and a CO furnace. The CO furnace and the zeolite rotor are connected through a preheating pipeline group. The external waste heat utilization transducer and the zeolite rotor are connected through a first pipeline. The inlet of the CO furnace is connected to the external waste heat utilization transducer through a second pipeline, the outlet of the CO furnace is connected to the external waste heat utilization transducer through a third pipeline, and the external waste heat utilization transducer is connected to the main air pipe through a fourth pipeline.

[0010] Furthermore, in the present utility model, the preheating pipeline group includes an exhaust gas preheating inlet pipe and an exhaust gas heating outlet pipe. One end of the exhaust gas preheating inlet pipe is connected to the zeolite rotor, and the other end is connected to the CO furnace; one end of the exhaust gas heating outlet pipe is connected to the CO furnace, and the other end is connected to the zeolite rotor.

[0011] Furthermore, in the present utility model, the CO furnace includes a furnace body, and a combustion chamber and an internal waste heat utilization transducer both disposed in the furnace body. The heat exchange area of the internal waste heat utilization transducer is smaller than that of the external waste heat utilization transducer; there are three layers of plate-shaped catalysts disposed in the combustion chamber, and the three layers of catalysts are arranged in parallel at intervals; the inlet of the combustion chamber and the external waste heat utilization transducer are connected through the second pipeline, the inlet of the internal waste heat utilization transducer is connected to the outlet of the combustion chamber, and the outlet of the internal waste heat utilization transducer and the external waste heat utilization transducer are connected through the third pipeline; one end of the exhaust gas preheating inlet pipe far from the zeolite rotor and one end of the exhaust gas heating outlet pipe far from the zeolite rotor are both connected to the internal waste heat utilization transducer.

[0012] Furthermore, in the present utility model, a cold inlet and a cold outlet are provided on the internal waste heat utilization transducer. One end of the exhaust gas preheating inlet pipe far from the zeolite rotor is connected to the cold inlet, and one end of the exhaust gas heating outlet pipe far from the zeolite rotor is connected to the cold outlet.

[0013] Furthermore, in the present utility model, a fifth pipeline is connected to the third pipeline, and one end of the fifth pipeline far from the third pipeline is connected to the fourth pipeline; a proportional regulating valve is provided on the fourth pipeline.

[0014] Furthermore, in the present utility model, a desorption fan is provided on the first pipeline.

[0015] Furthermore, in the present utility model, an air inlet valve is provided on the air inlet pipe.

[0016] Furthermore, in the present utility model, a drying room is connected to one end of the main air pipe far from the adsorption fan.

[0017] The beneficial effects of the present utility model are:

[0018] The utility model provides an energy-saving and efficient waste gas purification catalytic combustion treatment system, mainly separating the external waste heat utilization heat exchanger with a larger heat exchange area from the catalytic combustion equipment (CO furnace), and connecting a fifth pipeline beside it, and installing a proportional regulating valve on the fifth pipeline; embedding the internal waste heat utilization heat exchanger with a smaller heat exchange area than the external waste heat utilization transducer into the catalytic combustion equipment (CO furnace). This structure not only reduces the volume of the catalytic combustion equipment, making the equipment more compact and easy to construct, but also solves the problems of large fluctuations in the inlet concentration of waste gas, unstable heat exchange, and difficult heating control. Brief Description of the Drawings

[0019] Figure 1 is a schematic structural diagram of an embodiment of the utility model;

[0020] Figure 2 is a schematic structural diagram of the CO furnace of an embodiment of the utility model.

[0021] In the figure: 101 - air inlet pipe; 102 - four-stage filter; 103 - zeolite rotor; 104 - adsorption fan; 201 - main air pipe; 301 - external waste heat utilization transducer; 302 - CO furnace; 3021 - furnace body; 3022 - combustion chamber; 3023 - internal waste heat utilization transducer; 3024 - catalyst; 303 - first pipeline; 304 - second pipeline; 305 - third pipeline; 306 - fourth pipeline; 307 - fifth pipeline; 308 - proportional regulating valve; 401 - waste gas preheating inlet pipe; 402 - waste gas heating outlet pipe; 501 - desorption fan; 601 - air inlet valve. Specific Embodiments

[0022] Next, the technical solutions of the present utility model will be clearly and completely described in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present utility model.

[0023] Please refer to Figure 1 and Figure 2 , the present utility model provides a technical solution:

[0024] An energy-saving and highly efficient waste gas purification catalytic combustion treatment system includes a first treatment device and a second treatment device. The first treatment device includes an air inlet pipe 101, a four-stage filter 102, a zeolite rotor 103, and an adsorption fan 104 that are connected in sequence. The outlet of the adsorption fan 104 is connected to a main air pipe 201. The second treatment device includes an external waste heat utilization transducer 301 and a CO furnace 302. The CO furnace 302 and the zeolite rotor 103 are connected through a preheating pipeline group. The external waste heat utilization transducer 301 and the zeolite rotor 103 are connected through a first pipeline 303. The inlet of the CO furnace 302 is connected to the external waste heat utilization transducer 301 through a second pipeline 304, and the outlet of the CO furnace 302 is connected to the external waste heat utilization transducer 301 through a third pipeline 305. The external waste heat utilization transducer 301 and the main air pipe 201 are connected through a fourth pipeline 306.

[0025] Specifically, the preheating pipeline group includes an exhaust gas preheating inlet pipe 401 and an exhaust gas heating outlet pipe 402. One end of the exhaust gas preheating inlet pipe 401 is connected to the zeolite rotor 103, and the other end is connected to the CO furnace 302. One end of the exhaust gas heating outlet pipe 402 is connected to the CO furnace 302, and the other end is connected to the zeolite rotor 103.

[0026] Specifically, the CO furnace 302 includes a furnace body 3021, and a combustion chamber 3022 and an internal waste heat utilization transducer 3023 that are both arranged inside the furnace body 3021. The heat exchange area of the internal waste heat utilization transducer 3023 is smaller than that of the external waste heat utilization transducer 301. Inside the combustion chamber 3022, there are three layers of plate-shaped catalysts 3024 arranged in parallel at intervals. The inlet of the combustion chamber 3022 and the external waste heat utilization transducer 301 are connected through the second pipeline 304. The inlet of the internal waste heat utilization transducer 3023 is connected to the outlet of the combustion chamber 3022, and the outlet of the internal waste heat utilization transducer 3023 and the external waste heat utilization transducer 301 are connected through the third pipeline 305. One end of the exhaust gas preheating inlet pipe 401 far from the zeolite rotor 103 and one end of the exhaust gas heating outlet pipe 402 far from the zeolite rotor 103 are both connected to the internal waste heat utilization transducer 3023.

[0027] In order to maximize the utilization of the heat generated by the catalytic combustion of waste gas, the heat exchange area of the external waste heat utilization heat exchanger is increased, so that the high-temperature flue gas can be fully heat-exchanged through the external waste heat utilization heat exchanger. When the inlet concentration of the waste gas flowing into the external waste heat utilization transducer 301 through the first pipeline 303 is the lowest, the temperature of the waste gas after heat exchange through the external waste heat utilization heat exchanger can also reach about 300 °C, so that the natural gas burner (not shown in the figure) installed on the furnace body 3021 of the CO furnace 302 hardly works, achieving the purpose of energy conservation.

[0028] In addition, in a conventional catalytic combustion device, the catalyst 3024 filling area is an integral whole. When the waste gas almost completes catalytic combustion in the first half of the catalytic area and reaches the highest value of the temperature after catalytic combustion; when the waste gas has completely passed through the catalytic area, the catalytic temperature decreases. Therefore, when we collect temperature data in the catalytic area, there is a deviation from the actual temperature after catalysis. This deviation may cause the catalyst 3024 to occasionally exceed its own limit safety temperature, resulting in the inactivation of the catalyst 3024 due to overheating. To solve this deviation, we divide the catalyst 3024 area into three parts, and collect temperature data from the middle of the catalyst 3024 and the rear of the catalyst 3024 area simultaneously to ensure the authenticity of the data, thereby achieving precise and safe control and extending the service life of the catalyst 3024.

[0029] In some embodiments of the present embodiment, a cold inlet and a cold outlet are provided on the internal waste heat utilization transducer 3023. One end of the waste gas preheating inlet pipe 401 far from the zeolite rotary wheel 103 is communicated with the cold inlet, and one end of the waste gas heating outlet pipe 402 far from the zeolite rotary wheel 103 is communicated with the cold outlet.

[0030] In some embodiments of the present embodiment, a fifth pipe 307 is communicated with the third pipe 305. One end of the fifth pipe 307 far from the third pipe 305 is communicated with the fourth pipe 306; a proportional regulating valve 308 is provided on the fourth pipe 306. When the high-temperature flue gas after catalytic combustion approaches this value, the proportional regulating valve 308 performs PID integral regulation to reduce the heat exchange amount of the high-temperature flue gas (instead of increasing fresh air and reducing the waste gas inlet amount and diluting the inlet concentration before), thereby controlling the temperature of the high-temperature flue gas after waste gas catalytic combustion not to exceed the waste gas ignition temperature, so as to achieve the maximum waste gas treatment amount and realize the high efficiency and safety of the catalytic combustion device.

[0031] In some embodiments of the present embodiment, a desorption fan 501 is provided on the first pipe 303. The desorption fan 501 is used to send the gas in the zeolite rotary wheel 103 into the external waste heat utilization transducer 301 through the first pipe 303.

[0032] In order to control the flow rate of the air inlet pipe 101, an air inlet valve 601 is specifically installed on the air inlet pipe 101.

[0033] In some embodiments of the present embodiment, one end of the main air pipe 201 far from the adsorption fan 104 is connected to a drying room (not shown in the figure). The drying room can cure and dry the semi-finished products in the production process, realizing the positive income of the waste gas purification device.

[0034] Working principle:

[0035] The waste gas enters the four-stage filter 102 through the air inlet pipe 101, and enters the zeolite rotor 103 after being treated by the four-stage filter 102. After being treated by the zeolite rotor 103, most of the gas has reached the emission standard, but there is still some high-concentration waste gas that has not been completely treated. Most of the gas that meets the emission standard is drawn away by the adsorption fan 104 and discharged into the main air duct 201, and then discharged to the drying room for drying through the main air duct 201 and discharged after drying.

[0036] This part of the waste gas that has not been completely treated first enters the internal waste heat utilization transducer 3023 in the CO furnace 302 through the waste gas preheating inlet pipe 401 for preheating, and then is discharged into the zeolite rotor 103 through the waste gas heating outlet pipe 402, and then flows into the external waste heat utilization transducer 301 through the first pipe 303 under the action of the desorption fan 501. After being heated by the external waste heat utilization transducer 301, the waste gas enters the combustion chamber 3022 in the CO furnace 302 for catalytic combustion, and after combustion, it is discharged into the external waste heat utilization transducer 301 through the third pipe 305, and finally discharged into the main air duct 201 through the fourth pipe 306. The third pipe 305 is connected to the fourth pipe 306 through the fifth pipe 307. The proportional regulating valve 308 on the fifth pipe 307 is used to regulate the flow rate of the third pipe 305 to control the temperature of the gas flowing out of the internal waste heat utilization transducer 3023.

[0037] The above is only the preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be changed within the scope of the concept described herein through the above teachings or the technology or knowledge in related fields. As long as the changes and variations made by those skilled in the art do not depart from the spirit and scope of the present invention, they should all be within the protection scope of the appended claims of the present invention.

Claims

1. An energy-saving and efficient exhaust gas purification catalytic combustion treatment system, characterized in that: The invention comprises a first treatment device and a second treatment device, wherein the first treatment device comprises an air inlet pipe (101), a four-stage filter (102), a zeolite rotor (103) and an adsorption fan (104) which are connected in sequence, and the outlet of the adsorption fan (104) is connected to a main air duct (201); the second treatment device comprises an external waste heat utilization transducer (301) and a CO furnace (302), and the CO furnace (302) and the zeolite rotor (103) are connected via a preheating pipeline group; The external waste heat utilization transducer (301) and the zeolite rotor (103) are in communication with each other via a first pipe (303); the inlet of the CO furnace (302) is in communication with the external waste heat utilization transducer (301) via a second pipe (304); the outlet of the CO furnace (302) is in communication with the external waste heat utilization transducer (301) via a third pipe (305); and the external waste heat utilization transducer (301) is in communication with the main air duct (201) via a fourth pipe (306).

2. The energy-saving and high-efficiency exhaust gas purification catalytic combustion treatment system according to claim 1 is characterized by: The preheating pipe group comprises an exhaust gas preheating inlet pipe (401) and an exhaust gas heating outlet pipe (402); one end of the exhaust gas preheating inlet pipe (401) is connected to the zeolite rotor (103), and the other end is connected to the CO furnace (302); one end of the exhaust gas heating outlet pipe (402) is connected to the CO furnace (302), and the other end is connected to the zeolite rotor (103).

3. The energy-saving and high-efficiency exhaust gas purification catalytic combustion treatment system according to claim 2 is characterized in that: The CO furnace (302) comprises a furnace body (3021), and a combustion chamber (3022) and an internal waste heat utilization transducer (3023) both arranged in the furnace body (3021), wherein the heat exchange area of ​​the internal waste heat utilization transducer (3023) is smaller than the heat exchange area of ​​the external waste heat utilization transducer (301); three layers of catalyst (3024) with a plate structure are arranged in parallel and spaced apart; an inlet of the combustion chamber (3022) and the external waste heat utilization transducer (30 1) The inlet of the internal waste heat utilization transducer (3023) is connected to the outlet of the combustion chamber (3022) through the second pipe (304), and the outlet of the internal waste heat utilization transducer (3023) is connected to the external waste heat utilization transducer (301) through the third pipe (305); one end of the exhaust gas preheating inlet pipe (401) away from the zeolite rotor (103) and one end of the exhaust gas heating outlet pipe (402) away from the zeolite rotor (103) are both connected to the internal waste heat utilization transducer (3023).

4. The energy-saving and high-efficiency exhaust gas purification catalytic combustion treatment system according to claim 3 is characterized by: The internal waste heat utilization transducer (3023) is provided with a cold inlet and a cold outlet, the end of the exhaust gas preheating inlet pipe (401) away from the zeolite rotor (103) is connected to the cold inlet, and the end of the exhaust gas heating outlet pipe (402) away from the zeolite rotor (103) is connected to the cold outlet.

5. The energy-saving and high-efficiency exhaust gas purification catalytic combustion treatment system according to claim 4 is characterized in that: The third pipeline (305) is connected to a fifth pipeline (307), and one end of the fifth pipeline (307) away from the third pipeline (305) is connected to the fourth pipeline (306); the fourth pipeline (306) is provided with a proportional regulating valve (308).

6. The energy-saving and high-efficiency exhaust gas purification catalytic combustion treatment system according to claim 1 is characterized in that: A desorption fan (501) is provided on the first pipeline (303).

7. The energy-saving and high-efficiency exhaust gas purification catalytic combustion treatment system according to claim 1 is characterized by: The air inlet pipe (101) is provided with an air inlet valve (601).

8. The energy-saving and high-efficiency exhaust gas purification catalytic combustion treatment system according to claim 1 is characterized in that: One end of the main air duct (201) away from the adsorption fan (104) is connected to a drying room.

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